package ooday04;

import javax.swing.*;

//多态的演示
public class PolymorphicDemo {
    public static void main(String[] args) {
        /*
        //演示向上造型的语法：
        Dog o1 = new Dog("小黑",3,"黑");    //狗是狗
        //o1.name/age/color/drink()/eat()/swim()/lookHome();
        Animal o2 = new Dog("小黑",3,"黑"); //狗是动物 ---------向上造型
        //o2.name/age/color/drink()/eat();
        Swim o3 = new Dog("小黑",3,"黑");   //狗会游泳 ---------向上造型
        //o3.swim();
         */


        /*
        //演示向上造型（多态）的第1点应用：
        Master master = new Master();
        Dog dog = new Dog("小黑",3,"黑");
        Chick chick = new Chick("小花",1,"花");
        Fish fish = new Fish("小金",2,"金");
        master.feed(dog);
        master.feed(chick);
        master.feed(fish);
         */



        //演示向上造型（多态）的第2点应用：
        //Animal o = new Animal();//编译错误，抽象类不能被实例化
        Animal[] animals = new Animal[5];
        animals[0] = new Dog("小黑",3,"黑");
        animals[1] = new Dog("小白",2,"白");
        animals[2] = new Fish("小金",1,"金");
        animals[3] = new Fish("小花",2,"花");
        animals[4] = new Chick("小黄",1,"黄");
        for (int i=0;i<animals.length;i++){ //遍历所有动物
            System.out.println(animals[i].name); //输出每个动物的名字
            animals[i].drink(); //每个动物喝水
            animals[i].eat(); //每个动物吃饭

            if (animals[i] instanceof Dog){
                Dog dog = (Dog)animals[i];
                dog.LookHome();
            }
            if (animals[i] instanceof Chick){
                Chick chick = (Chick)animals[i];
                chick.layEggs();
            }
            if (animals[i] instanceof Swim){ //适用于所有实现Swim接口的（会游泳的）
                Swim s = (Swim)animals[i];
                s.swim();
            }
        }



        /*
        //演示强转成功的条件
        Animal o = new Dog("小黑",2,"黑");
        Dog g = (Dog)o;     //引用o所指向的对象，就是Dog类型
        Swim s = (Swim)o;   //引用o所指向的对象，实现了Swim接口
        //Fish f = (Fish)o;   //运行时会发生ClassCastException类型转换异常

        System.out.println(o instanceof Dog);   //true
        System.out.println(o instanceof Swim);  //true
        System.out.println(o instanceof Fish);  //true
        if (o instanceof Fish){ //fales
            Fish f = (Fish)o;
        }
         */
    }
}
